JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 973 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
2. 2.⚡ What number does this code print?
   let a = 47;
   let b = 13;
   console.log(a - b);
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
5. 5.⚡ What number does this code print?
   let apples = 14;
   apples = apples + 10;
   apples = apples - 17;
   console.log(apples);
6. 6.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
7. 7.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) if
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
9. 9.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
10. 10.⚡ What number does this code print?
    let score = 16;
    score = score + 8;
    score = score - 6;
    console.log(score);
11. 11.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 5;
    apples = apples - 33;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let score = 13;
    score = score + 5;
    score = score - 7;
    console.log(score);
13. 13.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 7;
    apples = apples - 10;
    console.log(apples);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
16. 16.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 13;
    coins = coins - 7;
    console.log(coins);
20. 20.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
21. 21.⚡ What number does this code print?
    let a = 51;
    let b = 24;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 12;
    marks = marks - 16;
    console.log(marks);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) if
24. 24.⚡ What number does this code print?
    let books = 20;
    books = books + 12;
    books = books - 29;
    console.log(books);
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
26. 26.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
29. 29.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 3;
    runs = runs - 18;
    console.log(runs);
30. 30.⚡ What number does this code print?
    let score = 22;
    score = score + 13;
    score = score - 9;
    console.log(score);
31. 31.⚡ What number does this code print?
    let score = 5;
    score = score + 12;
    score = score - 1;
    console.log(score);
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
33. 33.⚡ What number does this code print?
    let a = 18;
    let b = 37;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 5;
    apples = apples - 11;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
36. 36.⚡ What number does this code print?
    let a = 36;
    let b = 25;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
39. 39.⚡ What number does this code print?
    let a = 47;
    let b = 34;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 30;
    let b = 25;
    console.log(a - b);

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